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Commercial Tenant Improvement HVAC

HVAC for Commercial Tenant Improvements

3rdGen delivers HVAC construction for commercial tenant improvements throughout the Bay Area—from existing-condition review and equipment selection through coordination, installation, controls, startup, and closeout.

Whether the project is being built from an established mechanical design or requires design-assist support, we help turn the HVAC scope into a coordinated, buildable system.

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CA Lic 1086898 • Bay Area commercial tenant improvement HVAC • Licensed & insured

Project Inquiry

Start Project Information

Share project location, timeline, drawings if available, and a short description of the HVAC scope. We will review and follow up.

Capabilities

Built for Commercial Buildout HVAC

  • Plan-Spec Construction

    Price, coordinate, and build the HVAC scope from issued mechanical drawings and specifications.

  • Design-Assist

    Contractor input while routing, equipment, and constructability are still being developed.

  • Existing Building Coordination

    Evaluate what can remain, what must change, and how the system fits the shell.

  • VRF + Split Systems

    Multi-zone and split-system solutions where zoning and concealed integration matter.

  • Ventilation + Exhaust

    Outside air, exhaust, and ventilation modifications coordinated with the new layout.

  • Controls + Startup

    Controls interfaces, startup, verification, and closeout as part of the mechanical scope.

Existing Conditions

Built for the Reality of Tenant Improvement Work

Tenant improvements rarely begin with a blank mechanical slate.

Existing rooftop units, ductwork, shafts, electrical infrastructure, controls, neighboring tenants, landlord requirements, and architectural constraints all influence what can actually be built.

Our role is to understand those conditions early and turn the mechanical scope into a system that works with the project—not against it.

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3rdGen technician coordinating spiral duct installation during a commercial retail tenant improvement

Existing Infrastructure

Evaluate what can remain, what needs modification, and what must be replaced.

New Space Requirements

Match HVAC, ventilation, zoning, and controls to the new occupancy and layout.

Trade Coordination

Resolve mechanical requirements alongside framing, ceilings, electrical, plumbing, fire protection, and architectural work.

Construction Sequencing

Plan the HVAC work around access, inspections, shutdowns, occupancy, and the overall project schedule.

More Than Moving Diffusers Around

A New Floor Plan Can Change the Entire Mechanical Strategy

A tenant improvement may look simple on paper, but changes to room use, occupancy, glazing, ceilings, equipment loads, kitchens, restrooms, conference rooms, or operating hours can materially change what the HVAC system needs to do.

We review the mechanical scope in the context of the new space rather than assuming the existing system can simply be rearranged.

  1. Capacity

    Does the existing equipment still have enough capacity for the new use?

  2. Air Distribution

    Do the new rooms receive the airflow they actually require?

  3. Ventilation

    Does outside-air delivery still satisfy the occupancy and space configuration?

  4. Zoning

    Do different areas need independent temperature control?

  5. Exhaust

    Are new restrooms, kitchens, specialty rooms, or process spaces creating additional exhaust requirements?

  6. Controls

    Does the existing control strategy still make sense after the TI?

3rdGen technician servicing a Mitsubishi Electric rooftop unit during commercial tenant improvement HVAC work

Mechanical Scope

Tenant Improvement HVAC Scope

  • HVAC Equipment

    Reuse, modify, relocate, or replace equipment based on the project requirements and existing conditions.

  • Ductwork + Air Distribution

    New duct systems, branch modifications, diffusers, grilles, registers, returns, dampers, and related distribution work.

  • VRF + Multi-Zone Systems

    VRF and multi-zone heat-pump systems for projects requiring flexible zoning and concealed mechanical integration.

  • Ventilation + Outside Air

    Outside-air systems, ventilation modifications, ERV/HRV integration, and coordination with the building's existing ventilation strategy.

  • Exhaust

    Restroom, general, kitchen-adjacent, specialty, and other project-specific exhaust systems.

  • Controls

    Thermostats, zone controls, equipment interfaces, centralized controls, and coordination with building-management systems where applicable.

  • Equipment Replacement

    Replacement or modernization of aging HVAC equipment when the TI scope creates the right opportunity to address it.

  • Startup + Commissioning

    System startup, control verification, airflow review, equipment operation, and closeout support.

Process

From Plans to a Buildable Mechanical Scope

Tenant improvement HVAC requires constant translation between drawings and field conditions. Our process is built around finding conflicts early, clarifying the scope, and keeping the mechanical work coordinated as the project develops.

  1. 01 — Review

    • Architectural plans
    • Mechanical plans
    • Existing equipment
    • Site conditions
    • Landlord requirements
    • Project schedule
    • Scope boundaries

  2. 02 — Clarify

    • Existing versus new work
    • Equipment responsibilities
    • Duct modifications
    • Ventilation requirements
    • Controls scope
    • Electrical requirements
    • Roof / structural impacts
    • Coordination items

  3. 03 — Coordinate

    • GC
    • Architect
    • Mechanical engineer
    • Electrical
    • Plumbing
    • Fire sprinkler
    • Structural
    • Controls vendors
    • Equipment suppliers

  4. 04 — Build + Turn Over

    • Procurement
    • Installation
    • Inspections
    • Startup
    • Controls verification
    • Punch list
    • Closeout

Coordination

Designed Around the Space, Not Added Afterward

Mechanical systems compete for the same limited space as architecture, structure, lighting, plumbing, and fire protection.

The earlier those conflicts are identified, the easier the HVAC system is to build cleanly.

The goal is not simply to make the HVAC fit. It is to make it feel like it belonged in the project from the beginning.

We coordinate around:

  • Ceiling heights, soffits, and open ceilings
  • Structure, shafts, and roof penetrations
  • Diffusers, duct paths, and exposed distribution
  • Lighting layouts and architectural finishes
  • Equipment clearances and access panels

Field Verification

Existing Building Conditions Matter

A tenant improvement inherits every mechanical decision that came before it—often without reliable documentation.

Undocumented ductwork, abandoned equipment, mixed controls, and infrastructure that no longer matches the building are common. We verify what is actually in place before the scope depends on it.

What we verify first

  • Equipment & controls

    Installed equipment, available capacity, zoning, and how the system is controlled today.

  • Distribution & ventilation

    Duct routing, outside air, exhaust paths, and whether they still fit the new layout.

  • Roof & building power

    Rooftop conditions, electrical service, and structural support for equipment changes.

  • Access & phasing

    Service clearances, occupied-building constraints, and how verification fits the schedule.

  • Drawings vs. field

    Record sets and landlord information checked against ceiling, roof, and equipment rooms.

Systems

Systems We Work With

Project Types

Tenant Improvement Project Types

Office Private offices, conference rooms, open workspaces, meeting areas, and support spaces.
Retail Customer-facing spaces requiring clean integration, zoning, and coordination with architectural finishes.
Restaurant + Hospitality Higher internal loads, ventilation considerations, kitchen coordination, and demanding occupancy profiles.
Medical + Professional Projects requiring careful zoning, ventilation, controls, and coordination between specialized rooms.
Education + Institutional Classrooms, administrative spaces, community facilities, and institutional tenant improvements.
Mixed-Use Commercial TI work within buildings containing residential, retail, office, or other mixed occupancies.

Project Teams

Built to Work With the Project Team

Shared audience pages explain how 3rdGen supports each role — from scope review and submittals through installation and closeout.

  • General contractors & estimators
  • Architects & design teams
  • Mechanical engineers of record

Each audience page explains how we support that role — from scope review through field execution.

  1. 01 For General Contractors

    Preconstruction, bidding, submittals, RFIs, coordination, installation, schedule, punch, and closeout.

    Mechanical scope that stays aligned with the GC schedule — from plan-spec bids through field execution.

    Mechanical Support for GCs

  2. 02 For Architects

    Early mechanical input, constructability, equipment coordination, and architectural integration.

    Practical mechanical feedback before routing, access, and visible components are locked in by field conditions.

    Coordination for Architects

  3. 03 For Engineers

    Execution of engineered designs through startup, TAB/commissioning support, and closeout.

    Submittals, RFIs, field coordination, and controls-ready installation aligned with the engineer’s design intent.

    Working With Engineers

Selected Work

Commercial Tenant Improvement & Buildout Projects

Selected Bay Area commercial mechanical work across tenant improvements, VRF, and coordinated buildouts.

View all work

Common Questions

Tenant Improvement HVAC Questions

Plan-spec bids, design-assist, existing equipment, duct modifications, VRF, ventilation, controls, and occupied-building phasing.

Can you bid tenant improvement HVAC from completed plans?

Yes. We perform plan-spec mechanical construction and can price the HVAC scope from an issued set of drawings and specifications.

Can you help if the mechanical design is incomplete?

Yes. Depending on the project, we can provide design-assist support or help develop the mechanical scope before construction.

Can existing HVAC equipment remain?

Sometimes. We evaluate equipment condition, capacity, zoning, ventilation, controls, and the requirements of the new tenant layout before relying on existing equipment.

Can you modify existing ductwork?

Yes. TI projects frequently involve modifying existing duct systems, relocating supply and return air, adding zones, and integrating new distribution into existing infrastructure.

Do you install VRF systems for tenant improvements?

Yes. VRF can be a strong solution where the project requires multiple zones, heat-pump operation, flexible piping, or concealed indoor equipment.

Do you handle ventilation and exhaust?

Yes. We can incorporate outside air, exhaust, ERV/HRV systems, and other ventilation requirements into the mechanical scope.

Do you coordinate controls?

Yes. Controls are treated as part of the complete mechanical system rather than an afterthought.

Can you work in occupied buildings?

Yes, depending on the scope. Shutdowns, access, noise, phasing, and temporary conditions should be addressed during planning.

What areas do you serve?

3rdGen performs commercial mechanical work throughout the Bay Area, with a primary focus on projects where our design, coordination, and installation capabilities add value.

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Project Inquiry

Planning a Tenant Improvement?

Send us the plans, project location, schedule, and current mechanical scope. We can review the project and determine whether the next step is a plan-spec estimate, design-assist discussion, or existing-condition walkthrough.

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